Antisiphon-valve.



No. 878,430. PATENTED FEB. 4, 1908. w. B. THOMSON.

ANTISIPHON VALVE.

APPLIUATION FILED AUG-12, 1907.

. irr y h l h l lll Witnesses:

1!": NuRRls PETERS Cu. wAsnmc'rou. c.

and internal threads, 12, adapted to fit the ex WILLIAM B. THOMSON, OFGHARLEROI, PENNSYLVANIA.

ANTISIPHON-VALVE No. 878,430. Specification of Letters Patent. PatentedFeb. 4., 1908.

Application filed August 12. 1907. Serial No. 388.075.

To all whom it may concern:

Be it known that I, VVILLIAM B. THOMSON, a citizen of the United States,residing at Charleroi, in the county of l/Vashington and State ofPennsylvania, have invented a new and useful Improvement in AntisiphonValves, of which improvement the following is a specification.

My invention relates to an improvement in an anti-siphon valve, intendedto be used usually on traps for closets, sewers, etc., using water for acheck valve to odors and gases.

The object of my invention is to prevent the siphoning of the water fromthe trap by preventing the suction of the outflowing pipe from operatingon the trap water.

For aworkable understanding of my invention reference should be made tothe drawings illustrating the parts embodying the mechanism of the same,specifications and claims.

In the accompanying drawings Figure 1 is the vertical perspective of thecasing. Fig. 2 is a vertical half section, showing the con structiveparts set for operation. Fig. 3 is a horizontal view looking downward.

A, is the exterior incasing shell or casing, B, the interior joinedparts.

C, is a trap pipe.

D, is the washer, E, the collar, and 6 is a ball valve.

A, the casing, is hollow and attached, preferably by screw threads, tothe trap pipe, C; it is supported uprightly, and supports by areinforced annular rim 4 of the upper end, theinternal part, B; the saidcasing, A, is open at the lower end to communicate with the passage inthe pipe, O, to which it is attached.

B, the internal part, consists of a bent tube b with a short-arm. End,1, of the said tube projects through the lid, 3, at, 9, and is incommunication with the air; it is provided with a perforated dustshield, 5. A pliable washer, D, is placed between the said lid, 3, andrim, 4, to prevent the leakage of air or gases. The said lid, 3, issecured in place on the upper end of the said casing by collar, E, thesaid collar is provided with a shoulder 11 terior threads, 13, of therim, 4, of the casing,

the washer, D, being between the said lid, 3, and rim, 4. End, 2, isprovided with a larger closed cylindrical terminal cap or head 6,attached, preferably by screw threads. Said terminal, 6, is perforated,7, 7, 7, etc. The said terminal 6 is hollow and contains a ball, 8,preferably rubber, resting on the end, 2. The said ball is adapted toslide up and down the said terminal 6 when actuated by the "flow of air.

The operation is as follows: When the siphoning force oi the outflowingpipe, C, pulls at the contents in the higher part of the trap, the airand ball in the terminal 6, being lighter than the water in the seal ofthe trap, will yield and automatically draw and lift the ball from itsseat and let the air in the vacuum there being made, thereby preventingthe said siphoning force from drawing the water out of the seal of thetrap.

WVhat I claim as new and desire to secure by Letters Patent is 1. In anair inlet valve for sewer traps, the combination with a casing adaptedto be detachably secured to the crown of the trap, of a removable lidfor the casing, a clamping collar securing the lid in position, a benttube having one end detachably secured to the lid and depending withinthe casing and having at its other end a vertically facing valve seat,and a valve litting the seat.

2. In an air inlet valve for sewer traps,

the combination with a casing adapted to bedetachably secured to thecrown of the trap, of a removable apertured lid for the casing, a collarhaving exterior screw threaded engagement with the upper portion of thecasing and an internal flange engaging the outer surface of the lid, abent tube screw threaded into the aperture of the lid and dependingwithin the casing and having at its other end a vertically facing valveseat, a ball valve fitting the seat, and a cage inclosing' said valve.

3. In an air inlet valve for sewer traps, the combination with a casingadapted to be detachably secured to the crown of the trap, of aremovable apertured lid for the casing, packing between the lid and thecasing, a collar having exterior screw threaded engagement with theupper portion of the casing and an internal flange engaging the outersurface of the lid, a bent tube screw threaded In testimony whereof Ihave hereunto into the aperture of the lid and depending signed my namein the presence of two sub- Within the casing and having at its otherend scribing Witnesses.

a vertically facing valve seat, a valve fitting WILLIAM B. THOMSON. theseat, a shield perforated in its upper part In the presence of inclosingthe valve, and a strainer secured BOYD E. OLLER,

to the tube outside the lid. v JOHN MAINES.

